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#58 DTE: A Task recovery mechanism

The actual DTE doesn't permit to recovery the
elaboration of a task when the corresponding Worker
shuts down due to some hw/sw failure.
Therefore it would be very important to implement a
Task recovery mechanism that, based on some
notification mechanism, would control the execution of
each remote Worker, and could recovery the state of a
died Worker by making the interrupted Task available
for some other Worker in the cluster.